Discussion
Assertion (A): Illuminant D65 has no exact physical realisation.
Reason (R): It is defined as a table of relative spectral power rather than as a lamp.
Answer: C
Both are true and the reason gives the reason, and daylight simulators approximate it imperfectly. How well a simulator matches is itself assessed by a defined metamerism index. Grades run from A down to E in the standard.
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